Mass Transfer Studies in Sorbing Porous Media: III. Experimental Evaluation with 2,4,5‐T

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Abstract
Comparisons are made between observed and calculated effluent concentration distributions for the movement of 2,4,5‐T (2,4,5‐trichlorophenoxyacetic acid) through 30‐cm long unsaturated soil columns. The comparisons are made using both analytical and numerical solutions of a previously published model, which included the effects of intra‐aggregate diffusion and adsorption. The results in this study indicate that intra‐aggregate diffusion and adsorption/desorption are the main mechanisms responsible for effluent tailing. An estimated 60% of the adsorption. Was found to occur in the stagnant region of the soil. When intra‐aggregate diffusion was included in the model, the observed adsorption/desorption hysteresis phenomenon found to be significant in several earlier studies, was shown to be much less important in describing the observed concentration distributions.
Funding Information
  • U.S. Department of the Interior

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